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Microorganisms immobilized by membrane inclusion: kinetic measurements in a fixed bed bioreactor and oxygen consumption calculations

Content Provider	Springer Nature Link
Author	Müh, T. Bratz, E. Rückel, M.
Copyright Year	1999
Abstract	Cells living in the pores of macroporous carriers can be immobilized by coating the carriers with a porous membrane. To evaluate the performance of cells immobilized with such a technique, a fixed bed bioreactor was used to study the oxidation of D-sorbitol to L-sorbose by Acetobacter suboxydans. Comparisons were made of immobilized cells to cells living in the pores of a non-coated carrier and to cells living in the absence of a carrier (“submerged cells”). Productivity was similar in all three cultures (4.6–6.3 g sorbose l−1 h−1). Biomass concentration at the outlet was highest for submerged cells (1.3 · 109 cells ml−1) but was equal for coated and non-coated carriers (0.4 · 109 cells ml−1). Examination of the coated carriers under the electron microscope revealed that only a thin layer near the surface was actually colonized by bacteria. Interestingly, when normalized on the basis of volume, sorbitol oxidation in the colonized layer appeared to be about 100-fold faster than in the bulk medium. A model was derived for oxygen relations inside the coated carriers. This model implicates that the inner parts of the carrier are not colonized by bacteria due to oxygen limitation. The findings indicate that coated carriers have potential to catalyze biotransformations at very high rates, and identify oxygen supply and confinement of cells to the carriers as issues that need further attention. The mathematical model for oxygen concentration profiles inside the coated carriers will be useful for designing improved carriers.
Starting Page	405
Ending Page	412
Page Count	8
File Format	PDF
ISSN	0178515X
Journal	Bioprocess Engineering
Volume Number	20
Issue Number	5
e-ISSN	16157605
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-05-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Applied Microbiology and Biotechnology Biotechnology

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Microorganisms immobilized by membrane inclusion: kinetic measurements in a fixed bed bioreactor and oxygen consumption calculations

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